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Finding the Fourth Proportional to 12.92, 19.34 and 8.39

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Solution

The fourth proportional to 12.92, 19.34 and 8.39 is: 12.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.92 : 19.34 = 8.39 : x
  2. Step 2: Convert to fraction form
    12.92/19.34 = 8.39/x
  3. Step 3: Cross multiply
    12.92x = 19.34 × 8.39
  4. Step 4: Simplify right side
    12.92x = 162.30
  5. Step 5: Solve for x
    x = 162.30/12.92
  6. Step 6: Final answer
    x = 12.57

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